Hey guys, just bought a 2007 Impreza Wagon, with what supposedly was a leaky thermostat. It also has an aftermarket muffler and intake, so when I asked what the check engine light was on for, it wasn't suspicious when he said that it was just the O2 sensor. When I was driving it home, the engine overheated, so I pulled over to let it cool, then continued to drive, rinse and repeat 6 more times, because there was no coolant in the system. So when I got it home I ran an OBD scanner, and it came back with four codes, P0171/4 which are system too lean on banks 1 and 2, and codes P0301/2 which is cylinder 1 and 2 misfires. What should I do to troubleshoot these codes?
TL/DR need help troubleshooting codes P0171/4, P0301/2
TL/DR need help troubleshooting codes P0171/4, P0301/2